Fig. 1. Structural diagram of the designed THz filter

Fig. 2. (a) Transmission coefficient simulation; (b) the current distribution of the incident wave at the x-axis deflection position and the transmission formant position (f= 1.34 THz)

Fig. 3. (a) Simulated transmission characteristics at different d; (b) soild line: simulated transmission characteristics under different arms spacing l and length p; dotted line: simulated transmission characteristics under different double H spacing distance s and length p

Fig. 4. (a) Microscope photo of filter sample; (b) schematic diagram of the transmission THz-TDS system; (c) terahertz transmission frequency domain signal; (d) relative transmittance spectra